forex_monthly
Fetch monthly FX time series data for specified currency pairs using the Alpha Vantage API. Input from and to symbols (e.g., EUR/USD) to retrieve data in JSON or CSV format.
Instructions
Fetches monthly time series data for a Forex pair.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| datatype | No | Data format for the response. | json |
| from_symbol | Yes | The currency symbol to convert from (e.g., "EUR"). | |
| to_symbol | Yes | The currency symbol to convert to (e.g., "USD"). |
Input Schema (JSON Schema)
{
"additionalProperties": false,
"description": "Parameters for fetching weekly/monthly Forex time series data.",
"properties": {
"datatype": {
"default": "json",
"description": "Data format for the response.",
"enum": [
"json",
"csv"
],
"type": "string"
},
"from_symbol": {
"description": "The currency symbol to convert from (e.g., \"EUR\").",
"type": "string"
},
"to_symbol": {
"description": "The currency symbol to convert to (e.g., \"USD\").",
"type": "string"
}
},
"required": [
"from_symbol",
"to_symbol"
],
"type": "object"
}
Implementation Reference
- src/index.ts:762-773 (registration)Registers the 'forex_monthly' MCP tool, including its description, input schema, and handler function that delegates execution to the Alpha Vantage 'forex.monthly' method via the executeAvantageTool helper.server.addTool({ name: "forex_monthly", description: "Fetches monthly time series data for a Forex pair.", parameters: schemas.ForexWeeklyMonthlyParamsSchema, execute: ( args, context // Let type be inferred ) => executeAvantageTool("forex_monthly", args, context, (av, params) => av.forex.monthly(params) ), });
- src/index.ts:766-772 (handler)The execute handler function for the 'forex_monthly' tool. It receives args and context, then calls executeAvantageTool which manages the AVantage client and invokes av.forex.monthly(params).execute: ( args, context // Let type be inferred ) => executeAvantageTool("forex_monthly", args, context, (av, params) => av.forex.monthly(params) ),
- src/schemas.ts:165-169 (schema)Zod schema defining input parameters for the forex_monthly tool: from_symbol and to_symbol (required), datatype (optional json/csv). Shared with forex_weekly.export const ForexWeeklyMonthlyParamsSchema = z.object({ from_symbol: z.string().describe('The currency symbol to convert from (e.g., "EUR").'), to_symbol: z.string().describe('The currency symbol to convert to (e.g., "USD").'), datatype: DatatypeSchema.default('json').optional(), }).describe('Parameters for fetching weekly/monthly Forex time series data.')
- src/index.ts:38-115 (helper)Shared helper function used by all tools, including forex_monthly. Manages API key, creates/reuses AVantage client via resource manager, executes the specified AVantage method, handles errors with UserError, and returns stringified JSON data.async function executeAvantageTool<TArgs, TResult>( toolName: string, args: TArgs, context: Context<Record<string, unknown> | undefined>, // Use the imported Context type directly avantageMethod: ( av: AVantage, args: TArgs ) => Promise<{ error?: boolean; reason?: string; data?: TResult }> ): Promise<string> { logger.info(`Executing '${toolName}' tool for request ID: ${context}`); logger.debug(`Args for ${toolName}: ${JSON.stringify(args)}`); // --- Authentication & Resource Management --- // Access extraArgs safely - it might be null or undefined const extraArgsApiKey = context.extraArgs?.apiKey as string | undefined; const apiKey = extraArgsApiKey || config.apiKey; if (!apiKey) { logger.error(`'${toolName}' failed: Alpha Vantage API key missing.`); throw new UserError(apiKeyErrorMessage); } logger.debug( `Using AV API key (source: ${extraArgsApiKey ? "extraArgs" : "environment"}) for ${toolName}` ); try { // Get or create AVantage instance managed by ResourceManager const av = await resourceManager.getResource<AVantage>( apiKey, // Cache key is the resolved API key "avantage_client", // Type identifier for logging async (key) => { // Factory Function logger.info( `Creating new AVantage instance for key ending ...${key.slice(-4)}` ); // AVantage library reads AV_PREMIUM from process.env internally return new AVantage(key); }, async (avInstance) => { // Cleanup Function (no-op needed for AVantage) logger.debug(`Destroying AVantage instance (no-op)`); } ); // --- Library Call --- const result = await avantageMethod(av, args); // --- Response Handling --- if (result.error) { logger.warn( `'${toolName}' failed. Reason from avantage: ${result.reason}` ); throw new UserError(result.reason || `Tool '${toolName}' failed.`); } if (result.data === undefined || result.data === null) { logger.warn(`'${toolName}' completed successfully but returned no data.`); return "null"; // Return string "null" for empty data } logger.info(`'${toolName}' completed successfully.`); // Stringify the data part of the response return JSON.stringify(result.data); } catch (error: any) { logger.error( `Error during execution of '${toolName}': ${error.message}`, error ); // If it's already a UserError, rethrow it if (error instanceof UserError) { throw error; } // Otherwise, wrap it in a UserError throw new UserError( `An unexpected error occurred while executing tool '${toolName}': ${error.message}` ); } }